Nuclear Data Sheets for A=153

Determination of the Half-Life of Gadolinium-148

“…Considering the decay of the 153 Gd tracer between the two activity measurements (before deposition and the measurement after deposition, i.e., 210 days), a (3.18 ± 0.13)% plating yield was obtained. The uncertainty on the plating yield includes the 1.42% uncertainty on the geometry correction factor deduced in (Chiera et al, 2022) which allows a direct comparison of the count rate of the 153 Gd in solution and the count rate of the 153 Gd deposited on the graphite foil, as well as takes into account the 0.42% uncertainty on the half-life of the 153 Gd tracer (Nica, 2020). The amount of 148 Gd plated on the graphite foil corresponds hence to (3.778 ± 0.038) × 10 12 atoms.…”

“…The Gd was extracted from the radioactive Ta matrix with the methodology reported in (Talip et al, 2017), and separated from other lanthanides and spallation products by applying a series of ion-exchange chromatographic columns, as described in (Chiera et al, 2020). During separation, the short-lived γ-ray emitter 153 Gd (t 1/2 = 144.4 d, E γ (29%) = 97.43 keV (Nica, 2020)) was added as an internal radiotracer. The separated Gd fraction in 1 M HNO 3 phase (here referred to as "Gd master solution") was then analyzed by mass-spectrometry without further purification.…”

Determination of the Terbium-152 Half-Life from Mass-Separated Samples from CERN-ISOLDE and Assessment of the Radionuclide Purity

“…The WLS fit analysis for the IC and LS techniques also relies on the accuracy of the half-lives used. Whilst the half-life of 155 Tb has recently been measured in Collins et al (2022b) the half-lives of the significant contaminants are based upon a single determination or small literature datasets from the 1980s or earlier (Nica, 2020;Singh, 2009;Sonzogni, 2004). Significant changes to these half-lives in the future could alter the results of the half-lives determined for the IC and LS techniques.…”